/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.otrue.patienthealthmanager.receiver;

import android.app.KeyguardManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Parcel;
import android.util.Log;
import cn.otrue.patienthealthmanager.R;
import cn.otrue.patienthealthmanager.activity.AlarmAlert;
import cn.otrue.patienthealthmanager.activity.AlarmAlertFullScreen;
import cn.otrue.patienthealthmanager.activity.SetAlarm;
import cn.otrue.patienthealthmanager.bean.Alarm;
import cn.otrue.patienthealthmanager.bean.Alarms;
import cn.otrue.patienthealthmanager.utils.AlarmAlertWakeLock;

/**
 * Glue class: connects AlarmAlert IntentReceiver to AlarmAlert activity. Passes
 * through Alarm ID.
 */
public class AlarmReceiver extends BroadcastReceiver {

	/**
	 * If the alarm is older than STALE_WINDOW, ignore. It is probably the
	 * result of a time or timezone change
	 */
	private final static int STALE_WINDOW = 30 * 60 * 1000;

	@Override
	public void onReceive(Context context, Intent intent) {
		if (Alarms.ALARM_KILLED.equals(intent.getAction())) {
			// The alarm has been killed, update the notification
			updateNotification(context,
					(Alarm) intent
							.getParcelableExtra(Alarms.ALARM_INTENT_EXTRA),
					intent.getIntExtra(Alarms.ALARM_KILLED_TIMEOUT, -1));
			return;
		} else if (Alarms.CANCEL_SNOOZE.equals(intent.getAction())) {
			Alarms.saveSnoozeAlert(context, -1, -1);
			return;
		} else if (!Alarms.ALARM_ALERT_ACTION.equals(intent.getAction())) {
			// Unknown intent, bail.
			return;
		}

		Alarm alarm = null;
		// Grab the alarm from the intent. Since the remote AlarmManagerService
		// fills in the Intent to add some extra data, it must unparcel the
		// Alarm object. It throws a ClassNotFoundException when unparcelling.
		// To avoid this, do the marshalling ourselves.
		final byte[] data = intent.getByteArrayExtra(Alarms.ALARM_RAW_DATA);
		if (data != null) {
			Parcel in = Parcel.obtain();
			in.unmarshall(data, 0, data.length);
			in.setDataPosition(0);
			alarm = Alarm.CREATOR.createFromParcel(in);
		}

		if (alarm == null) {
			Log.v("wangxianming", "Failed to parse the alarm from the intent");
			// Make sure we set the next alert if needed.
			Alarms.setNextAlert(context);
			return;
		}

		// Disable the snooze alert if this alarm is the snooze.
		Alarms.disableSnoozeAlert(context, alarm.id);
		// Disable this alarm if it does not repeat.
		if (!alarm.daysOfWeek.isRepeatSet()) {
			Alarms.enableAlarm(context, alarm.id, false);
		} else {
			// Enable the next alert if there is one. The above call to
			// enableAlarm will call setNextAlert so avoid calling it twice.
			Alarms.setNextAlert(context);
		}

		// Intentionally verbose: always log the alarm time to provide useful
		// information in bug reports.
		long now = System.currentTimeMillis();

		// Always verbose to track down time change problems.
		if (now > alarm.time + STALE_WINDOW) {
			Log.v("wangxianming", "Ignoring stale alarm");
			return;
		}

		// Maintain a cpu wake lock until the AlarmAlert and AlarmKlaxon can
		// pick it up.
		AlarmAlertWakeLock.acquireCpuWakeLock(context);

		/* Close dialogs and window shade */
		Intent closeDialogs = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
		context.sendBroadcast(closeDialogs);

		// Decide which activity to start based on the state of the keyguard.
		Class c = AlarmAlert.class;
		KeyguardManager km = (KeyguardManager) context
				.getSystemService(Context.KEYGUARD_SERVICE);
		if (km.inKeyguardRestrictedInputMode()) {
			// Use the full screen activity for security.
			c = AlarmAlertFullScreen.class;
		}

		// Play the alarm alert and vibrate the device.
		Intent playAlarm = new Intent(Alarms.ALARM_ALERT_ACTION);
		playAlarm.putExtra(Alarms.ALARM_INTENT_EXTRA, alarm);
		context.startService(playAlarm);

		// Trigger a notification that, when clicked, will show the alarm alert
		// dialog. No need to check for fullscreen since this will always be
		// launched from a user action.
		Intent notify = new Intent(context, AlarmAlert.class);
		notify.putExtra(Alarms.ALARM_INTENT_EXTRA, alarm);
		PendingIntent pendingNotify = PendingIntent.getActivity(context,
				alarm.id, notify, 0);

		// Use the alarm's label or the default label as the ticker text and
		// main text of the notification.
		String label = alarm.getLabelOrDefault(context);
		Notification n = new Notification(R.drawable.stat_notify_alarm, label,
				alarm.time);
		n.setLatestEventInfo(context, label,
				context.getString(R.string.alarm_notify_text), pendingNotify);
		n.flags |= Notification.FLAG_SHOW_LIGHTS
				| Notification.FLAG_ONGOING_EVENT;
		n.defaults |= Notification.DEFAULT_LIGHTS;

		// NEW: Embed the full-screen UI here. The notification manager will
		// take care of displaying it if it's OK to do so.
		Intent alarmAlert = new Intent(context, c);
		alarmAlert.putExtra(Alarms.ALARM_INTENT_EXTRA, alarm);
		alarmAlert.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
				| Intent.FLAG_ACTIVITY_NO_USER_ACTION);
		n.fullScreenIntent = PendingIntent.getActivity(context, alarm.id,
				alarmAlert, 0);

		// Send the notification using the alarm id to easily identify the
		// correct notification.
		NotificationManager nm = getNotificationManager(context);
		nm.notify(alarm.id, n);
	}

	private NotificationManager getNotificationManager(Context context) {
		return (NotificationManager) context
				.getSystemService(Context.NOTIFICATION_SERVICE);
	}

	private void updateNotification(Context context, Alarm alarm, int timeout) {
		NotificationManager nm = getNotificationManager(context);

		// If the alarm is null, just cancel the notification.
		if (alarm == null) {
			if (true) {
				Log.v("wangxianming",
						"Cannot update notification for killer callback");
			}
			return;
		}

		// Launch SetAlarm when clicked.
		Intent viewAlarm = new Intent(context, SetAlarm.class);
		viewAlarm.putExtra(Alarms.ALARM_ID, alarm.id);
		PendingIntent intent = PendingIntent.getActivity(context, alarm.id,
				viewAlarm, 0);

		// Update the notification to indicate that the alert has been
		// silenced.
		String label = alarm.getLabelOrDefault(context);
		Notification n = new Notification(R.drawable.stat_notify_alarm, label,
				alarm.time);
		n.setLatestEventInfo(
				context,
				label,
				context.getString(R.string.alarm_alert_alert_silenced, timeout),
				intent);
		n.flags |= Notification.FLAG_AUTO_CANCEL;
		// We have to cancel the original notification since it is in the
		// ongoing section and we want the "killed" notification to be a plain
		// notification.
		nm.cancel(alarm.id);
		nm.notify(alarm.id, n);
	}
}
